upstream u-boot with additional patches for our devices/boards:
https://lists.denx.de/pipermail/u-boot/2017-March/282789.html (AXP crashes) ;
Gbit ethernet patch for some LIME2 revisions ;
with SPI flash support
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89 lines
2.4 KiB
89 lines
2.4 KiB
13 years ago
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/*
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* (C) Copyright 2011
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* Holger Brunck, Keymile GmbH Hannover, holger.brunck@keymile.com
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <i2c.h>
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#include <asm/io.h>
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#include <linux/ctype.h>
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#include "../common/common.h"
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static void i2c_write_start_seq(void)
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{
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struct fsl_i2c *dev;
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dev = (struct fsl_i2c *) (CONFIG_SYS_IMMR + CONFIG_SYS_I2C_OFFSET);
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udelay(DELAY_ABORT_SEQ);
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out_8(&dev->cr, (I2C_CR_MEN | I2C_CR_MSTA));
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udelay(DELAY_ABORT_SEQ);
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out_8(&dev->cr, (I2C_CR_MEN));
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}
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int i2c_make_abort(void)
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{
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struct fsl_i2c *dev;
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dev = (struct fsl_i2c *) (CONFIG_SYS_IMMR + CONFIG_SYS_I2C_OFFSET);
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uchar dummy;
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uchar last;
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int nbr_read = 0;
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int i = 0;
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int ret = 0;
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/* wait after each operation to finsh with a delay */
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out_8(&dev->cr, (I2C_CR_MSTA));
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udelay(DELAY_ABORT_SEQ);
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out_8(&dev->cr, (I2C_CR_MEN | I2C_CR_MSTA));
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udelay(DELAY_ABORT_SEQ);
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dummy = in_8(&dev->dr);
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udelay(DELAY_ABORT_SEQ);
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last = in_8(&dev->dr);
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nbr_read++;
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/*
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* do read until the last bit is 1, but stop if the full eeprom is
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* read.
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*/
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while (((last & 0x01) != 0x01) &&
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(nbr_read < CONFIG_SYS_IVM_EEPROM_MAX_LEN)) {
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udelay(DELAY_ABORT_SEQ);
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last = in_8(&dev->dr);
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nbr_read++;
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}
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if ((last & 0x01) != 0x01)
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ret = -2;
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if ((last != 0xff) || (nbr_read > 1))
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printf("[INFO] i2c abort after %d bytes (0x%02x)\n",
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nbr_read, last);
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udelay(DELAY_ABORT_SEQ);
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out_8(&dev->cr, (I2C_CR_MEN));
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udelay(DELAY_ABORT_SEQ);
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/* clear status reg */
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out_8(&dev->sr, 0);
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for (i = 0; i < 5; i++)
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i2c_write_start_seq();
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if (ret != 0)
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printf("[ERROR] i2c abort failed after %d bytes (0x%02x)\n",
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nbr_read, last);
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return ret;
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}
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